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For the oil well where sand has been produced, we may squeeze the slurry into high permeable sand after sand plug is cleaned out. 对于已经出砂的油井，也可以在清洗砂堵后将高渗透水泥浆挤入高渗砂层，待其凝固后形成高渗透性人工屏障进行后期防砂。